This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A027231 #8 Oct 25 2019 10:05:37 %S A027231 1,2,6,26,91,424,1563,7490,28363,138154,532277,2622108,10229514, %T A027231 50827494,200236656,1001864238,3978724091,20024629606,80072228433, %U A027231 405071776024,1629554359654,8281491341260,33495987519034,170937706521070,694795683685757,3559265886170942 %N A027231 Self-convolution of row n of array T given by A026758. %K A027231 nonn %O A027231 0,2 %A A027231 _Clark Kimberling_ %E A027231 More terms from _Sean A. Irvine_, Oct 24 2019